12697909 has 24 divisors (see below), whose sum is σ = 16251840. Its totient is φ = 9846144.

The previous prime is 12697901. The next prime is 12697913. The reversal of 12697909 is 90979621.

It is not a de Polignac number, because 12697909 - 2³ = 12697901 is a prime.

It is a super-2 number, since 2×12697909² = 322473785944562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12697901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21117 + ... + 21709.

It is an arithmetic number, because the mean of its divisors is an integer number (677160).

Almost surely, 2^12697909 is an apocalyptic number.

12697909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12697909 is the 2254-th heptagonal number.

It is an amenable number.

12697909 is a deficient number, since it is larger than the sum of its proper divisors (3553931).

12697909 is a wasteful number, since it uses less digits than its factorization.

12697909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 12697909 is about 3563.4125497899. The cubic root of 12697909 is about 233.2978501599.

The spelling of 12697909 in words is "twelve million, six hundred ninety-seven thousand, nine hundred nine".